QwtSlider - Man Page

The Slider Widget.

Synopsis

#include <qwt_slider.h>

Inherits QwtAbstractSlider.

Public Types

enum ScalePosition { NoScale, LeadingScale, TrailingScale }

Public Member Functions

QwtSlider (QWidget *parent=NULL)
QwtSlider (Qt::Orientation, QWidget *parent=NULL)
virtual ~QwtSlider ()
Destructor.
void setOrientation (Qt::Orientation)
Set the orientation.
Qt::Orientation orientation () const
void setScalePosition (ScalePosition)
Change the position of the scale.
ScalePosition scalePosition () const
void setTrough (bool)
bool hasTrough () const
void setGroove (bool)
bool hasGroove () const
void setHandleSize (const QSize &)
Set the slider's handle size.
QSize handleSize () const
void setBorderWidth (int)
Change the slider's border width.
int borderWidth () const
void setSpacing (int)
Change the spacing between trough and scale.
int spacing () const
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
void setScaleDraw (QwtScaleDraw *)
Set a scale draw.
const QwtScaleDraw * scaleDraw () const
void setUpdateInterval (int)
Specify the update interval for automatic scrolling.
int updateInterval () const

Protected Member Functions

virtual double scrolledTo (const QPoint &) const
Determine the value for a new position of the slider handle.
virtual bool isScrollPosition (const QPoint &) const
Determine what to do when the user presses a mouse button.
virtual void drawSlider (QPainter *, const QRect &) const
virtual void drawHandle (QPainter *, const QRect &, int pos) const
virtual void mousePressEvent (QMouseEvent *)
virtual void mouseReleaseEvent (QMouseEvent *)
virtual void resizeEvent (QResizeEvent *)
virtual void paintEvent (QPaintEvent *)
virtual void changeEvent (QEvent *)
virtual void timerEvent (QTimerEvent *)
virtual void scaleChange ()
Notify changed scale.
QRect sliderRect () const
QRect handleRect () const

Additional Inherited Members

Detailed Description

The Slider Widget.

QwtSlider is a slider widget which operates on an interval of type double. Its position is related to a scale showing the current value.

The slider can be customized by having a through, a groove - or both.

Member Enumeration Documentation

enum QwtSlider::ScalePosition

Position of the scale

See also

QwtSlider(), setScalePosition(), setOrientation()

Enumerator

NoScale

The slider has no scale.

LeadingScale

The scale is right of a vertical or below a horizontal slider.

TrailingScale

The scale is left of a vertical or above a horizontal slider.

Constructor & Destructor Documentation

QwtSlider::QwtSlider (QWidget * parent = NULL) [explicit]

Construct vertical slider in QwtSlider::Trough style with a scale to the left.

The scale is initialized to [0.0, 100.0] and the value set to 0.0.

Parameters

parent Parent widget

See also

setOrientation(), setScalePosition(), setBackgroundStyle()

QwtSlider::QwtSlider (Qt::Orientation orientation, QWidget * parent = NULL) [explicit]

Construct a slider in QwtSlider::Trough style

When orientation is Qt::Vertical the scale will be aligned to the left - otherwise at the the top of the slider.

The scale is initialized to [0.0, 100.0] and the value set to 0.0.

Parameters

parent Parent widget
orientation Orientation of the slider.

Member Function Documentation

int QwtSlider::borderWidth () const

Returns

the border width.

See also

setBorderWidth()

void QwtSlider::changeEvent (QEvent * event) [protected], [virtual]

Handles QEvent::StyleChange and QEvent::FontChange events

Parameters

event Change event

void QwtSlider::drawHandle (QPainter * painter, const QRect & handleRect, int pos) const [protected], [virtual]

Draw the thumb at a position

Parameters

painter Painter
handleRect Bounding rectangle of the handle
pos Position of the handle marker in widget coordinates

void QwtSlider::drawSlider (QPainter * painter, const QRect & sliderRect) const [protected], [virtual]

Draw the slider into the specified rectangle.

Parameters

painter Painter
sliderRect Bounding rectangle of the slider

QRect QwtSlider::handleRect () const [protected]

Returns

Bounding rectangle of the slider handle

QSize QwtSlider::handleSize () const

Returns

Size of the handle.

See also

setHandleSize()

bool QwtSlider::hasGroove () const

Returns

True, when the groove is visisble

See also

setGroove(), hasTrough()

bool QwtSlider::hasTrough () const

Returns

True, when the trough is visisble

See also

setTrough(), hasGroove()

bool QwtSlider::isScrollPosition (const QPoint & pos) const [protected], [virtual]

Determine what to do when the user presses a mouse button.

Parameters

pos Mouse position

Return values

True,when handleRect() contains pos

See also

scrolledTo()

Implements QwtAbstractSlider.

QSize QwtSlider::minimumSizeHint () const [virtual]

Returns

Minimum size hint

See also

sizeHint()

void QwtSlider::mousePressEvent (QMouseEvent * event) [protected], [virtual]

Mouse press event handler

Parameters

event Mouse event

Reimplemented from QwtAbstractSlider.

void QwtSlider::mouseReleaseEvent (QMouseEvent * event) [protected], [virtual]

Mouse release event handler

Parameters

event Mouse event

Reimplemented from QwtAbstractSlider.

Qt::Orientation QwtSlider::orientation () const

Returns

Orientation

See also

setOrientation()

void QwtSlider::paintEvent (QPaintEvent * event) [protected], [virtual]

Qt paint event handler

Parameters

event Paint event

void QwtSlider::resizeEvent (QResizeEvent * event) [protected], [virtual]

Qt resize event handler

Parameters

event Resize event

const QwtScaleDraw * QwtSlider::scaleDraw () const

Returns

the scale draw of the slider

See also

setScaleDraw()

QwtSlider::ScalePosition QwtSlider::scalePosition () const

Returns

Position of the scale

See also

setScalePosition()

double QwtSlider::scrolledTo (const QPoint & pos) const [protected], [virtual]

Determine the value for a new position of the slider handle.

Parameters

pos Mouse position

Returns

Value for the mouse position

See also

isScrollPosition()

Implements QwtAbstractSlider.

void QwtSlider::setBorderWidth (int width)

Change the slider's border width. The border width is used for drawing the slider handle and the trough.

Parameters

width Border width

See also

borderWidth()

void QwtSlider::setGroove (bool on)

En/Disable the groove

The slider can be cutomized by showing a groove for the handle.

Parameters

on When true, the groove is visible

See also

hasGroove(), setThrough()

void QwtSlider::setHandleSize (const QSize & size)

Set the slider's handle size. When the size is empty the slider handle will be painted with a default size depending on its orientation() and backgroundStyle().

Parameters

size New size

See also

handleSize()

void QwtSlider::setOrientation (Qt::Orientation orientation)

Set the orientation.

Parameters

orientation Allowed values are Qt::Horizontal and Qt::Vertical.

See also

orientation(), scalePosition()

void QwtSlider::setScaleDraw (QwtScaleDraw * scaleDraw)

Set a scale draw. For changing the labels of the scales, it is necessary to derive from QwtScaleDraw and overload QwtScaleDraw::label().

Parameters

scaleDraw ScaleDraw object, that has to be created with new and will be deleted in ~QwtSlider() or the next call of setScaleDraw().

See also

scaleDraw()

void QwtSlider::setScalePosition (ScalePosition scalePosition)

Change the position of the scale.

Parameters

scalePosition Position of the scale.

See also

ScalePosition, scalePosition()

void QwtSlider::setSpacing (int spacing)

Change the spacing between trough and scale. A spacing of 0 means, that the backbone of the scale is covered by the trough.

The default setting is 4 pixels.

Parameters

spacing Number of pixels

See also

spacing();

void QwtSlider::setTrough (bool on)

En/Disable the trough

The slider can be cutomized by showing a trough for the handle.

Parameters

on When true, the groove is visible

See also

hasTrough(), setGroove()

void QwtSlider::setUpdateInterval (int interval)

Specify the update interval for automatic scrolling. The minimal accepted value is 50 ms.

Parameters

interval Update interval in milliseconds

See also

setUpdateInterval()

QSize QwtSlider::sizeHint () const [virtual]

Returns

minimumSizeHint()

QRect QwtSlider::sliderRect () const [protected]

Returns

Bounding rectangle of the slider - without the scale

int QwtSlider::spacing () const

Returns

Number of pixels between slider and scale

See also

setSpacing()

void QwtSlider::timerEvent (QTimerEvent * event) [protected], [virtual]

Timer event handler

Handles the timer, when the mouse stays pressed inside the sliderRect().

Parameters

event Mouse event

int QwtSlider::updateInterval () const

Returns

Update interval in milliseconds for automatic scrolling

See also

setUpdateInterval()

Author

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Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide